Encore’s V.21 module implements ITU-T V.21 for data communication on PSTN. V.21 modem is FSK based modem for speeds up to 300bps. This uses two distinct frequencies for frequency shift keying. The center frequencies used are 1080Hz and 1750Hz for channel 1 and channel 2 respectively.

Encore’s V.23 module implements ITU-T V.23 for data communication on PSTN. V.23 modem is FSK based modem for speeds of 600bps and 1200bps. This uses two distinct frequencies for frequency shift keying. The center frequencies used are 1500Hz and 1700Hz. This supports a backward channel at 75bps.

• Adheres to all the mandatory features of ITU-T V.21 and ITU-T V.23 Standard.
• Employs Frequency Shift Keying.
• Support for both V.8 and Non-V.8 procedures during mode startup procedure for modulation mode selection.
• Tested against various impairment combinations using Telephone Network Emulator (TAS).
• Currently V.21 and V.23 Modems are available on TI’s TMS320C64x, TMS320C62x, TMS320C54x and Microchip’s dsPIC and ARM9 platforms.

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